Mechanical telephone



(No Model.)

M. GARL.

MECHANICAL TELEPHONE.

h4 V2M/M,

lill/lll WITNESS/FS.'

UNITED STATES PATENT @risica MANIOUS GARL, 0F CANTON, OHTO.

WlECi-iANiCAL TELEPHNE.

SFECPECATEON forming part of Letters Patent No. 387,636, dated Augustlll, 1888. Application iiled Octohcri, i887. Serial No. 253.248. (Nomodel.)

To @ZZ whom, it may concern:

Be it known that I, MANIOUS Gann, a citizen of the United States,residing at Canton, in the county o1' Stark and State of Ohio, haveinvented certain new and useful Improve` ments in Mechanical Telephones;and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part ol1 this speciiication, and to the letters and figures ofreference marked thereon, in which Figure 1 is a side elevation. Fig. 2is a vcrtical section through Fig. l at line .fr Fig. 3 is a similarsection with the main wire attached directly to the post. Fig. is adetached view of one of the diaphragm-rings, showing it partiallyinsulated. Fig. 5 is a detached view of the post, showing' amodification. Fig. G is a longitudinal section of the receiver. Fig. 7is a detached view ofthe insulator designed lo be used in turningcorners. Fig. S is a detached View of the receiverdiaphragm and itsconnecting-wires.

rEhe present invention relates to telephones of the mechanical class,and has for its objects to provide novel and simple means for adjust`ing the tension of the main wire upon the diaphragm, also to providemeans whereby tension of the main wire upon the diaphragm may bealtogether removed, and to provide novel means whereby every part of thetelephone is properly insulated.

-Similar letters of reference indicate corrcspondingparts in all ol' theiigures oi' the drawings.

ln the accompanying drawings, A rcpresents the frame or shelf, which maybe substantially of the form shown in the drawings, and is securelyattached in the desired position in any convenient and well-known manner. To the speaking end of the frame or shell A is attached the coverB, said cover bcing securely held to the lframe er shell A by means oi'the screws c. .For the purpose of securely holding the diaphragm C inproper position, the rings b b are provided, said rings being locatedsubstantially as shown in Figs. 2 and 3, thelowcr or under ring beingrecessed into the frame or shell A and the top or upper ring beingrecessed into the coverB.

These rings I) b are insulated by stretching rubber bands over them, or,if desired, they may be insulated with other suitable material. For thepurpose of clamping the rings b l) and the diaphragm C, the cover Bstrikes orbears against the top or upper ring before it reaches theframe or shell A, as illustrated in Figs. 2 and 3. To the center of thediaphragm C is attached the post D. The end of the post D, which passesthrough the diaphrag1n,is screw threaded to receive the nut c, as shownin the drawings. On each side of the diaphragm C are located the rubberor like collars d, said collars being located substantially as shown inFigs. 2 and For the purpose of holding the collars d d against the facesof the diaphragm C at all times, the metallic collar e and the springfare provided, said parts being located sub stantially as shown in Figs.2, 3, and

rlhe main wire E is attached to the shell or casing and then passedthrough an aperture in the post D, the set-screw being loose at thisstage of the proceedings and the main wire free to move back and forththrough the aperture in the post. When the desired tension is had on themain wire, the set-screw g is tightened, clamping the main wire to thepost.

ln adjusting the instrument, if the right tension is on the main wirethe post will be at right angles to the diaphragm, and if not the postwill be drawn to ene side, in which event the tension is adjusted untilthe post is straight. Thus by clamping the main wire to the post by theset-screw Vthe correct tension can be ascertained.

lt will be seen that the set-screw may be used for holding one end of amain wire, if it be desired to use a third instrument, thus allowingthrec instruments to be used with two main wires. The second wire if'attached to the shell deadcns the vibration.

The main wire E preferably attached to the adjustable eye-bar G, asshown in Fig. 2, which is screw-threaded tc receive the adjusting-nut H.

The eye-bar G passes through an aperture in the frame or shell A, and isheld in the desired position by means of the adjustingnut l-l. Betweenthe i'rame or shell A and the adusting-nut H is located the thimble orcollar .l s

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h, said thimble or collarbeing for the purpose of insulating the eye-barG, and is preferably formed of rubber.

For the purpose of adjusting the length of the post D, said post ispreferably formed in two pieces or sections, as shown in Fig. 2, saidsections being held together by screw-threads. In use the post D isdrawn upward or toward the diaphragm by means of the screw-threaded nutc, until the desired amount of tension is secured on the diaphragm C.

rIhe receiver I is substantially of the form shown in Figs. I and 6, andis formed of hard wood or other suitable material. The receiving end ofthe receiver I is funnelshaped, as shown in Fig. 6, and is provided withthe shoulder J for receiving and holding the diaphragm K, said diaphragmbeing securely held in the desired position by means of the thimble L,substantially as shown in Fig. 6. The diaphragm K is attached to thereceiving-wire h by means of the wires h2, said wires h passing throughthe center of the diaphragm K and extending across the face of saiddiaphragm, when they are bent or folded over the edges of saiddiaphragm, as shown in Figs. 6 and 8. The wires h2 are attached to thewire h. The wire h is preferably formed of ne wi res properly twistedand covered with silk.

By the above-described method of attaching the receiving-wire L to thediaphragm K the use of a button, which is in many instancesobjectionable, is obviated, and by reason of the wires h2 h2 passingover the face of the diaphragm tension is distributed over the surfaceof the diaphragm and materially strengthens it.

The instrument end of the wire h is attached to the post D,substantially as shown in Fig. 3, and as shown in Fig. 5 in case themodified form of post is used. In use the receiver I is placed to theear in the ordinary manner, at the same time having a slight tension onthe receiving wire, when the vibrations of the main wire E will betransmitted to the receiver I.

It will be understood that the receiving`- wire can be attached eitherto the post D or to the main wire E,as desired. For the purpose ofturning a corner with the main wire, as illustrated in Fig. 1, theinsulator M is provided,which is substantially of the form sho wn inFigs. l and 7 This insulator is preferably formed of hard-burned clay,and is provided in its center with the aperture z', and upon itsperiphery with the groove i. The aperture i is for the purpose ofreceiving the wire N,and the groove t" is for the purpose of receivingthe wire NQsaid wire N being wrapped around the insulator and looped,the opposite end of the wire N being attached to the pin O or itsequivalent. The rings b bare somewhat larger in diameter than thediameter of the diaphragm C, said parts being so arranged for thepurpose of perfectly insulating the diaphragm from the frame or shell A.

It will be seen that by my peculiar arrangement I am enabled to adjustthe tension of the main wire E on the diaphragm C, or entirely removethe tension when the main wire assumes the position shown in the dottedline, Fig. 2, the tension being adjusted or removed by means of the nutc. It will be seen that by this peculiar and novel arrangement alltension can be removed from the diaphragm while the line is being placedin proper position, thereby preventing the diaphragm from beingdestroyed by any sudden pull or jerk. The rings b b are covered upon allsides, so as to perfectlyinsulate the rings from the frame or shell A.

It will be seen that very thin material can be used for the diaphragm,as the tension of the main wire E can be adjusted to any desired strain.

Having fully described my invention, what Iclaim as new,and desire tosecure by Letters Patent, is

l. The combination, with the shell or casing, the cover, and thediaphragm, of the insulated rings b b, clamped between the shell andcover, the adjustable eye-bar G,the main wire E, the adjustable post D,and the setscrew g, substantially as described.

2. The combination, with the shell or casing and cover, of the post D,provided with the nut c, the non-metallic collars d (Land the spring f,the diaphragm C, and the main wire E, substantially as described.

3. The combination, with the receiver and its diaphragm, of the thimbleL, the wire L, and the wires 7L* attached thereto and passing throughthe diaphragm across the face thereof and folded over the edges of saiddiaphragm, substantially as described.

4. The combination7 with the shell or casing, the cover, and thediaphragm, of the post D, made in two sections screw-threaded to getherand provided with the nut c, collars d d, the collar e, and spring j',the adjustable screw-bar G,and thc main wire E,substantially asdescribed.

5. In a mechanical telephone, the combination, with the shell or casing,the cover, and the diaphragm, of the post D, made in two partsscrew-threaded together, said post having a hole for the passage of themain wire and being provided with the spring F, substantially asdescribed.

- In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

MANOS GARL.

Witnesses:

A. J. FULMER, FRED W. BOND.

IOO

